Car roof



Mara. 2(0), l 923.

C. D. BONSAI-L lGAR ROOF Filed May 8, 1922 Patented Mar., 2G), lQESO entre@ stares y tender garant ortica.

'CHARLES DAVTD BONSALL, 01E` PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 l?. H.

MURPHY COMPANY, OIF

rnnnsrnvnm I y can Application led May 8,

A 5 of Allegheny, and State of Pennsylvania, have invented a new andusetul Improvement in Gar Roofs, for which the following is a' specification.

This invention relates principally to car roofs of the all-steel riveted-up type wherein metal roof sheets extend from eaves to eaves of the car and are rigidly secured thereto and to each other to form a load sustaining structure. One ot, the principal objects ot' the present invention is to increase the strength and rigidity of the roof by improving the sectional shape of the roof sheets. Another obj ect of the invention is to simplify the operation of pressingthe roof sheets. Other objects are to reduce the weight of the root, to simplify the. construction thereof and-to reduce the cost of' manufacture.

rThe invention consists principally in stiffening the roofl sheets by means of a succession of raised offsets, whereby said sheets are adapted to carry a. considerable Vertical load and are capable of offering considerable resistance to the stresses that tend to distort the car-frame. rThe invention also consists in the parts and in the arrangements and combinations of parts hereinafter described and claimed.

ln the accompanying drawing, which forms part of' this specification and wherein like symbols refer to like parts wherever they occur, y

Fig. l is a. plan view of a portion of Aa car root embodying lmy invention;

Fig. 2 is an enlarged longitudinal section along the ridge line .of the roof on the line 2-2 in vFig. l;

F ig. 3 is a. transverse section through onehalf of the roof on the line 3-3 in Fig. l; and Fig. 4: is a section similar to Fig. 3 showp ing aY modified form of roof.

rllhe present roof comprises. heavy gage roof sheets 5, which are arranged crosswise of the car and slope upwardly trom the eaves to the ridge. The roof sheets are supported at theireaves ends on the uppermost flanges of angle-bar side plates 6 and are rigidly secured thereto by means of rivets 7. The eaves ends of the roof sheets are preterably provided with depending flanges 8 NEW KENSINGTON, PENNSYLVANM, A CORPORATION 0F noon.

1922. semi no. staat?.

that overhang the outer margins of the side plates and constitute drip flanges. 'lthe root sheets have their side margins overlapped and rigidly secured together by rivets 9 to form lap-seams or joints.

Running boards 10 are arranged lengthwise of the car at the ridge and are securely bolted to the uppermost lateral flanges of Z-shaped running board saddles 11, whose lowermost lateral Hanges rest on the overlapped side marginal portions of the roof sheets and are rigidly secured thereto by the -rivets 9 that` rigidly secure together said overlapped margins. e

llhe root sheets are stiffened, both transversely and 'longitudinally of the roof bly means of a series of raised ofi'sets B, C and D. The surfaces of the odset portions are of corresponding width and are odset both vertically and horizontally with relation to each other, the highest Surface D be-l ing located at the middle of the sheet and extending parallel with the side margins thereof and the lowermost surface being continuous and forming the side and end margins of the sheet. rll`he succession of raised surfaces A, B and C' extend continuously around the sheet, parallel with the side and 'end margins thereof, and are arranged one behind and above lthe other from the margins of the sheets to the raised middle portion D thereof, therebyv forming an even series of steps along all four sides of the sheets after the manner of a stepped pyra- 1n1 The above described-roof has many advantages. Tn the first place, the sheets, lo reason of the even series of continuous sha low steps formed the-rein, are well adapted to be pressed in a single operation of the press and without injury to themetal. ln the next place, the sheets are not only designed so that a light weight of metal will carry the vertical load, but are especially Well adapted to oti'er resistance to the horizontal stresses that tend to distort the carfrarne'and thus buckle the sheets. Tt may be noted that .the sectional shape of the sheets Ipermits stacking or nesting of the sheets one. on another and thus economizing space and minimizing the danger of -damaging the sheets in'shipping.y 4

Tn the modied construction shown in Fig. et, the continuous steps are of gradually decreased depth from ridge to eaves. This arrangement forms a stepped sheetl whose depth'is grea-testat the yridge,1wherehy'.the sheet is adapted to withstand a considerable vertical load vin this region.

Obviously,4v my' invention admits of considerable modification without departing thereof.v

2.- A car roof comprising a series of metal roof sheets connected together and to the car-frame, each'of said sheets comprising a raised :middle portion and a series of con- I tinuous steps extending from the margins of said sheet to the raised middle portion thereof, the portions of said steps that extend transversely of the roof ybeing deepest at -the ridge and gradually decreasing in depth towards the eaves.

3. A car roof comprising a series of metal roof sheets connected together and to the car-frame, said sheets having substantially4 the shape of a. rectangular stepped-pyramid.

4:. A car roof comprising a series of. metal roof sheets connected together and to the car-frame, said sheets being substantially the shape of a stepped pyramid, whose steps are deepest at the ridge and decrease in depth towards the eaves.

5. A car roof comprising a plurality of rectangular roof sheets extending from side plate to side plate and rigidly'connected Athereto and to eachv other, each of said roof sheets comprisingV araised middle portion and a succession of continuous rectangular steps extendlng from the four :tatami margins ofthe sheet to the raised middle portion thereof.

.6. A car roof comprising a plurality of metal roof sheets extending from side plate to side plate and rigidly connected thereto and to each other by"-lapjoints, each of said sheets comprising anoffset middle portion and acontinuous series of rectangular steps extending from the opposite margins lof said sheet to thev offset middle portion thereof.d

7 A car roof comprising a. series of metal roof sheets connected together and to the car-frame, eachof said sheets comprising an offset middle portion and a continuous series of rectangularsteps extending' from the margins of said sheet to the offset lmiddle portion thereof.-

8. A carroof sheet comprising an offset .middle portion-and va` series of rectangular steps extending from .the margins of said sheet to the offset middle portion thereof.

9. A c ar roof sheet comprising a raised middle portionand a series of steps between and parallel with the margins of said sheet i' and the raised middlev portion thereof.

10. A car roof sheet comprising raised middle portions andra series of steps between the margins of said sheet and the raised middle portion thereof` said ste-ps being deepest at the ridge and decreasing in depth on opposite sides thereof.

11. A car roof sheet having substantially the shape of a rectangularly stepped p vramid.

12. A car roof sheet having substantially the shape of a stepped pyramid, the portions of the steps extending lengthwise of the sheet being deepest at the ridge and decreasing in depth towards the eaves.

Signed at New Kensington, Pa., this 4 day of May, 1922.

CHARLES DAVID BONSALL. 

